it wants you to update the card,adding a new card is not update.
how did you remove the expired one,I dont think you can easily remove a card,lest there is unfinished business with that card.

You can easily remove card in your wallet. At least I did in one click, after adding a new one.

By "unfinished business" you mean potential buyers claims? I have a bank account attached.

And there was no way to update my expiring card. It didn't let me to change the card number only expiration date. And banks normally issue you a brand new card, after your current is expired. So I don't see why PP should insist on Updating.